/*!
-\page constructing_submeshes_page Constructing submeshes
+\page constructing_submeshes_page Constructing sub-meshes
-\n Construction of a submesh consists of:
+\tableofcontents
+
+By purpose, the sub-mesh is an object used to assign to a sub-shape
+different meshing parameters than those assigned to the main shape.
+
+Structurally, the sub-mesh is a mesh on a certain sub-shape, or a group of
+sub-shapes, possibly generated using different meshing algorithms
+and/or hypotheses than those used to generate the mesh on other
+sub-shapes.
+
+Creation of a sub-mesh allows to control individually meshing of a
+certain sub-shape, thus to get a locally coarser or finer mesh, to get
+elements of different types in the same mesh, etc.
+
+\section submesh_shape_section How to get a sub-shape for sub-mesh construction
+
+A sub-shape to create a sub-mesh on should be retrieved from the main shape
+in one of the following ways: <ul>
+<li> In Geometry module, via <em>New Entity > Explode</em> menu.</li>
+<li> In Geometry module, by creation of a group (<em>New Entity >
+ Group > Create Group</em> menu).</li>
+<li> In Mesh module, by
+ \ref subshape_by_mesh_elem "selecting a mesh element" generated on a
+ sub-shape of interest. This way is accessible if the mesh is
+ already computed.</li>
+<li> In Mesh module, by clicking <em>Publish Sub-shape</em> button in a
+ dialog showing \ref meshing_failed_anchor "meshing errors".</li>
+</ul>
+
+\section submesh_priority How hypotheses are selected among sub-meshes
+
+Internally, definition of meshing parameters to apply for
+discretization of a certain sub-shape, for example an edge of a
+compound of solids, starts from searching an algorithm, 1D as for the
+edge. The following sub-shapes are sequentially checked for presence
+of a sub-mesh where 1D algorithm is assigned:
+<ul>
+<li> the \b edge itself</li>
+<li> <b>groups of edges</b> containing the edge, if any</li>
+<li> \b wires sharing the edge</li>
+<li> \b faces sharing the edge</li>
+<li> <b>groups of faces</b> sharing the edge, if any</li>
+<li> \b shells sharing the edge</li>
+<li> \b solids sharing the edge</li>
+<li> <b>groups of solids</b> sharing the edge, if any</li>
+<li> the <b>main shape</b></li>
+</ul>
+(This sequence of sub-shapes defines the priority of sub-meshes. Thus more
+local, i.e. assigned to sub-shape of lower dimension, algorithms and
+hypotheses have higher priority during the search of hypotheses to
+apply.)
+
+As soon as a 1D algorithm is found, the search stops and the same
+sequence of sub-shapes is checked to find the main and additional 1D
+hypotheses, which can be taken into account by the found 1D algorithm.
+
+The multi-dimensional algorithms have a higher priority than
+uni-dimensional ones if they are assigned to sub-meshes of the
+same priority.
+
+If meshing parameters are defined on sub-meshes of the same priority,
+for example, different 1D hypotheses are assigned to two faces sharing
+an edge, the hypothesis assigned to a sub-shape with a lower ID will
+be used for meshing. You can \ref submesh_order_anchor "change" mutual
+priority of such concurrent sub-meshes.
+
+\section submesh_definition How to construct a sub-mesh
+
+\n Construction of a sub-mesh consists of:
<ul>
-<li>Selecting a mesh which will encapsulate your submesh</li>
-<li>Selecting a geometrical object for meshing</li>
-<li>Applying one or several previously described
+<li>Selecting a mesh which will encapsulate the sub-mesh</li>
+<li>Selecting a sub-shape for meshing</li>
+<li>Applying one or several
\ref about_hypo_page "hypotheses" and
\ref basic_meshing_algos_page "meshing algorithms" which will be used
-at computation of this submesh</li>
+for discretization of this sub-shape.</li>
</ul>
-<br><em>To construct a submesh:</em>
+<br><em>To construct a sub-mesh:</em>
\par
-From the \b Mesh menu select <b>Local Hyp.</b> or click <em>"Create
+From the \b Mesh menu select <b>Create Sub-mesh</b> or click <em>"Create
Sum-mesh"</em> button in the toolbar.
-\image html image33.gif
-<center><em>"Create Sum-mesh" button</em></center>
+<center>
+ \image html image33.gif
+ <em>"Create Sub-mesh" button</em>
+</center>
\par
The following dialog box will appear:
+\par
\image html createmesh-inv2.png
-\par
It allows to define the \b Name, the parent \b Mesh and the \b
Geometry (e.g. a face if the parent mesh has been built on box) of the
-submesh. You can define algorithms and hypotheses in the same way as
-in \ref constructing_meshes_page "Create mesh" menu.
+sub-mesh. You can define meshing algorithms and hypotheses in the same way as
+in \ref constructing_meshes_page "Create mesh" dialog.
-\par
-In the Object Browser the structure of the new submesh will be
+Later you can change the applied hypotheses or their parameters in
+\ref editing_meshes_page "Edit mesh/sub-mesh" dialog. Mesh entities
+generated using changed hypotheses are automatically removed.
+
+\anchor subshape_by_mesh_elem
+If the parent mesh is already computed, then you can define the
+\b Geometry by picking mesh elements computed on a sub-shape of interest
+in the 3D Viewer, i.e. you do not have to extract this sub-shape
+in Geometry module beforehand. To start element selection, press \a
+Selection button to the right of \b Geometry label. If this button is
+already down, then click it to release and then click it again. The
+following pop-up menu allowing to choose a way of geometry definition will
+appear.
+
+\image html choose_geom_selection_way.png
+
+<b>Direct geometry selection</b> enables selecting the sub-shape in the Object
+Browser.
+<b>Find geometry by mesh element selection</b> activates the following dialog.
+
+\image html find_geom_by_mesh_elem.png
+
+In this dialog, <b> Element Type </b> defines a kind of element to pick in the
+Viewer.
+Instead of picking an element in the Viewer, you can type its
+ID in <b> Element ID</b> field.
+<b> Geometry name </b> field allows defining a name of the sub-shape,
+with which the sub-shape will appear in the Object Browser (if not yet
+there).
+
+\section submesh_tree Sub-mesh in the Object Browser
+
+In the Object Browser the structure of the new sub-mesh will be
displayed as follows:
\image html image10.jpg
-\par
It contains:
<ul>
-<li>a reference to the geometrical object on the basis of which the submesh has been constructed;</li>
-<li><b>Applied hypotheses</b> folder containing the references to the
-hypotheses applied to the construction of the submesh;</li>
-<li><b>Applied algorithms</b> folder containing the references to the
-algorithms applied to the construction of the submesh.</li>
+<li>a sub-mesh name (\a SubMeshFace1)
+<li>a reference to the geometrical object on the basis of which the
+ sub-mesh has been constructed (<em>Cylindrical Face_1</em>);</li>
+<li><em>Applied hypotheses</em> folder containing references to
+hypotheses assigned to the sub-mesh;</li>
+<li><em>Applied algorithms</em> folder containing references to
+algorithms assigned to the sub-mesh.</li>
</ul>
<br><b>See Also</b> a sample TUI Script of a
-\ref tui_construction_submesh "Construct Submesh" operation.
+\ref tui_construction_submesh "Construct Sub-mesh" operation.
*/
